Method of forming wall plate structures for furnaces



June 28,. 1932. HQC. LORD 1,864,600

METHOD OF FORMING WALL PLATE STRUCTURES FOR FURNACES Filed June 20} 19302 Sheets-Sheet l I /4 1; @000 4 08000 8 s O '4 Q G 0000 9 Q Q OQOO 6INVENTOR.

H. C. LORD June 28, 1932.

METHOD OF FORMING WALL PLATE STRUCTURES FoR FURNAcEs Filed June 20, 19302 Sheets-Sheet 2 Patented June 28, 1932 UNITED STATES PATENT OFFICE HUGHC. LORD, OF ERIE, PENNSYLVANIA, ASSIGNOR TO ERIE CITY IRON WORKS, OF

' ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA METHOD OF FORMINGWALL PLATE STRUCTURES FOR FURNACES Application filed June 20,

The present invention is designed to simplify the forming of furnaceplates and the structure arising therefrom. It is particularly directedto a form of furnace in which some of the walls of the furnace formwalls of a superimposed boiler, the side plates of the furnace formingthe inside plates of water legs. In fabricating the boiler furnaces forthis combined furnace and boiler it is common to form the crown sheet ofthe furnace with the side walls of the furnace. In order that diflerentlengths of furnace may be formed it is desirable that the side plates bekept below the crown sheet so that in bending the crown sheet regardlessof the length of the furnace to be formed the side plates Will notinterfere with the easy bending, or forming of the crown sheet. It isalso desirable to provide such a furnace with a return flue projectionwhich extends upwardly from the rear of the furnace chamber, the frontof this projection being provided with a flue sheet from which the fluespass through the boiler. The simplicity in the forming of these sheetsand a reduction in the length of joints, usually welded joints, isparticularly desirable. The present construction accomplishes thispurpose in a very simple and con- Venient manner. Features and detailsof the invention will appear from the specification and claims.

A preferred embodiment of the structure and manner of practicing themethod is illustrated in the accompanying drawings as follows Fig. 1shows a central vertical section through the furnace and boiler.

Fig. 2 a section on the line 2-2 in Fig. 1.

Fig. 3 a section on the line 3-3 in Fig. 1.

Fig. 4 a detached View of the crown sheet with its depending sides.

Fig. 5 a detached view of the upper rear flue sheet.

Fig. 6 a perspective View of the rear plate of the furnace chamber.

Fig. 7 a detached View of the outer plate forming the rear water leg.

Fig. 8 a perspective view of the bottom rear flue sheet.

Fig. 9 a perspective view of the crown 1930. Serial No. 462,614.

sheet, the rear flue sheets and the rear water leg sheet detached fromthe rest of the furnace.

1 marks the furnace chamber, 2 the crown sheet over the furnace chamber,3 the depending side walls on the crown sheet, 4 an outer shell havingan upper cylindrical portion 5 forming the upper wall of the boiler, thedeper flue sheet 15 and discharge to a rear smoke box 16 and from thisto a stack connection 17 The rear flue sheet 10 forms the front wall ofa return flue projection 11 extending upwardly from the body of thefurnace. The crown sheet 2 is substantially horizontal having roundedcorners 20 leading to the side wall portion 3. The side walls extendsomewhat to the rear of the crown sheet 2. The flue sheet 10 has itslower edge 19 conforming to the contour of the crown sheet 2 includingthe rounded portion 20. Side walls 21 for the return flue projection 11are formed by rearwardly bent portions at the ends of the flue sheet.The lower edges 22 of the side walls 21 abut the upper edges 23 of thepart of the side wall 3 extending to the rear of the crown sheet. Theedge 19 is preferably welded to the rear end ofthe crown sheet and theedge 22 welded to the edge 23 of the side walls.

A rear wall 24 closes the furnace. It has a vertical portion 25 whichextends to the bottom of the furnace and an upper portion 26 which iscurved forwardly, the forward edge 27 of the upper portion meeting withand joining the upper edge 29 of the flue sheet 10. The side edges ofthe plate 24 are joined with the edges 21a: of the side plates 21 andthe edges of theportion 25 are joined with the vertical :part ofthe sideplate 21 and the rear end of the side walls 3. These joints are closedand completed by welding.

The upper rear crown sheet has its up per cylindrical edge connectedwith the upper portion 5 of the plate 4 and its sides connected with theside walls 6 of the plate 4. The lower edge 31 of this upper rear fluesheet is connected with the upper edge 32 of the rear water leg plate.33, this plate having a flange 34 at its lower end closing the bottomof the water leg, the side edges of this rear waterleg plate. beingconnected to the outer shell and being within a plate 17a forming theouter wall of the smoke box 16.

It will be noted that there is no obstruction on the rear end of theside wallS-to interfere with the easy bending of the portions, whetherthis is done'in-a press, or by a bending machine. Connecting the fluesheet with the side walls 21 eliminates a weld at the corner between theflue'sheet and the side walls. The total welding lines are Verymaterially reduced. The openings in the rear flue sheet are arrangedin'a comparatively small plate and in a plate that may be pre-formedbefore theseopenings are made and at any rate is small enough to bereadily fashioned. The rear closure plate is of simple construction andagain forms convenient joints with the adjacent parts.

-Vhat I claim as new is 1 1. The method of making furnace walls of metalplate, which consists in forming on a main plate a top and dependingsides; forming a flue sheet by shaping the same with its lower edgeconforming to the rear end of the top of the main sheet, and-bending theends of the'flue sheet rearwardly to pro- Vide sides for a returnprojection of the furnace chamber, bringing the lower edges of the bentends into joining relation with the sides of the main sheet; forming ,arear plate by shaping a rear plate to conform to the rear edges of thefurnace sides, bending said rear plate forwardlyto conform to the upperedges of'the rearwardly bent portions of the flue sheet and shaping theforward edge of said forwardly bent portion to conform to the upper edgeof the flue sheet; assembling the sheets by joining the bottom edge ofthe flue sheet and the lower edges of the rearwardly bent ends with therear end and sides of the main sheet, and the rear plate with the rearends of the sides of the main sheet. the top edges of the rearwardlybent ends of the flue sheet and the top edge of the flue sheet; andwelding the plates along the joined edges. 7

2. The method of making furnace walls of metal plate, which consists informing on a main plate a top and depending sides with a curvedconnection between the top and depending sides; forming a flue sheet byshaping the same with its lower edge conforming to the rear end of thetop of the main sheet, and bending the ends of the flue sheet theforward edge of said forwardly bent porq tion to conform to the upperedge of the flue sheet;-assembling the sheets by joining the bottom edgeof the flue sheet and the lower edges of the rearwardly bent ends withthe rear end and sides of the main sheet, and the rear plate with therear ends of the sides of the main sheet, the top edges of therearwardly bent ends of the flue sheet and the top edge of the fluesheet; and welding the plates along the joined edges.

3. The method of making furnace walls of metal plate, which consists informing on a main plate a top and depending sides with the side platesformed with plane surfaces and extending to the rear ofthe top of themain plate; forming a flue sheet by shaping the same with its lower edgeconforming to the rear end of the top of the main sheet, and bending theends of the flue sheet rearward- 1y to provide sides for a returnprojection of the furnace chamber, bringing the lower edges of the bentends into joining relation with the extending ends of the sides of themain sheet; forming a rear plate by shaping a rear plate to conform tothe rear edges of the furnace sides, bending said rear plate forwardlyto conform to the upper edges of the rearwardly bent portions of theflue sheet, and shaping the forward edge of said forwardly bent portionto conform to the upper edge of the flue sheet; assembling the sheets byjoining the bottom edge of the flue sheet and the lower edges oftherearwardly bent ends with the rear end and sides of the main sheet, andthe rear plate with the rear ends of the sides of the main sheet, thetop edges of the rearwardly bent ends of the flue sheet and the top edgeof the flue sheet; and welding the plates along the joined edges.

In testimony whereof I have hereunto set my hand.

HUGH C. LORD.

